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Summary of Offsetting Assets and Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Derivative instruments (assets)    
Gross fair value of recognized assets $ 93,334 $ 119,862
Financial instruments (46,156) (26,254)
Cash collateral received (46,916) (92,756)
Net fair value 262 852
Derivatives instrument (liabilities)    
Gross fair value of recognized liabilities 47,939 26,254
Financial instruments (46,156) (26,254)
Cash collateral received (910) 0
Net fair value $ 873 $ 0